Trees begin from tiny seeds, with a mass of a 2-3 grams, and yet an adult tree can weigh many thousands of pounds. If matter cannot be
created (Law of Conservation of Matter), where did the "stuff" that
makes a tree come from?

This is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?